STAR-ADVERTISER FILE Visitors take in the high surf at Waimea Bay.

STAR-ADVERTISER FILE

Visitors take in the high surf at Waimea Bay.

Dangerous surf conditions and minor coastal flooding will affect much of Hawaii through the weekend as peak monthly high tides combine with elevated water levels and a building northwest swell, according to the National Weather Service.

A high surf advisory is in effect for north- and west-facing shores of Niihau, Kauai and Oahu from noon today through 6 p.m. Friday, with surf expected to reach up to 10 to 16 feet. North- and west-facing shores of Molokai and Maui will be under a high surf advisory from 6 p.m. today through 6 p.m. Friday, with surf of up to 10 to 15 feet.

At the same time, a coastal flood statement remains in effect statewide through Saturday morning due to peak monthly high tides. Forecasters say water levels running higher than predicted could lead to isolated minor flooding in low-lying coastal areas, especially during early-morning high tides.

Vulnerable areas include coastal roadways, docks, boat ramps and other shoreline infrastructure. Impacts may include normally dry beaches flooding, minor coastal erosion and saltwater inundation.

Ocean safety officials warn that strong breaking waves and powerful currents will make swimming dangerous along exposed shores. Residents are urged to avoid driving through flooded roadways and to move vehicles and valuables to higher ground when possible. Boaters are advised to monitor mooring lines and be cautious of overwash near boat ramps.

The National Weather Service also said southerly to southeasterly winds will become locally breezy today, pushing clouds and showers mainly to east- and southeast-facing slopes. By Saturday, moderate easterly tradewinds are expected to return, bringing a more typical pattern of windward and mauka rainfall into early next week.

Don’t miss out on what’s happening!

Marine conditions will remain hazardous through Friday as the northwest swell peaks, with combined seas exceeding 10 feet in exposed waters. Small craft advisories remain in effect for most waters around Maui County and Hawaii island through early Saturday.